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Author Topic:   New Tires
as_soft
Associate Member
posted April 06, 2001 07:36 PM     Click Here to See the Profile for as_soft   Click Here to Email as_soft     Edit/Delete Message Reply w/Quote
Hi

I have a '93 LS 400 with 4 Goodyear 225/60 /16 that came on the car.
What tires should I replace them with
235/60, 235/55, 245/55 - / 16
I live in NJ therefore I need all weather tires

I'm wondering if anyone could give me the formula to calculate the diameter or/and the circumference of the tire

Thanking you in advance for your help

Ari

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donfromnaples
unregistered
posted April 07, 2001 08:12 PM           Edit/Delete Message Reply w/Quote
lived in Jersey for 23 years when I was younger. powerdog.com has a tire calculator. it seems the closest of the sizes you listed is 235/55R16 which has a 1.7% difference(slightly smaller overall diameter). of course slight changes of less than 5% will not throw your ABS off but they will change your odometer and speedo a bit. wider tires will do worse in snow but better in dry weather. hope this helps.

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GregZ
unregistered
posted April 26, 2001 11:58 AM           Edit/Delete Message Reply w/Quote

Hi, okay the calcs (I use english units) for a tire Overall Diameter: width in mm/25.4= width in inches. Width in inches x aspect ratio expressed as a decimal ie: 60 is .60) equals the height of your rubber above the rim(your sidewall) Multiply that times 2, add the rim diameter. this is the OD. For your 225/60R 16:

225/25.4 x .60 x 2 + 16 = 26.63" overall.

Switching to a 235 60 R 16 (recommended!) amounts to an almost negligible increase in height-

235/25.4 x .60 x 2 + 16 = 27.10" overall

BECAUSE, remember, you mount a wheel in its center, your wheel wells, your ground clearance, your everything 'sees' 1/2 the diametral increase, ie the radial increase- which measures out to just .235" larger than your OE tires (a little bit more than a quarter inch...) Bear in mind, your current tires are probably (due to wear) that amount SMALLER than they are supposed to be, so you in effect have the current 'error' in speedo, in ABS, etc- already (only in the low side) than you'll have on the upside with the 235s. What I'm saying, if the car works properly now with 'undersized' worn tires, it'll work with .235" 'oversized' ones. This fact escapes the tire sales people, consistently.... i have oversized EVERY car I've owned by on average one aspect ratio (and same or 1-up in width, also) and have been thrilled with the results each time... The factory, OE tires are definitely a compromise solution, not optimized for ANYBODY.


quote:
Originally posted by as_soft:
Hi

I have a '93 LS 400 with 4 Goodyear 225/60 /16 that came on the car.
What tires should I replace them with
235/60, 235/55, 245/55 - / 16
I live in NJ therefore I need all weather tires

I'm wondering if anyone could give me the formula to calculate the diameter or/and the circumference of the tire

Thanking you in advance for your help

Ari


IP: Logged

dboy
Associate Member
posted April 30, 2001 09:12 AM     Click Here to See the Profile for dboy   Click Here to Email dboy     Edit/Delete Message Reply w/Quote
to calculate the diameter of the tire follow this formula if for example the sidewall says 225/60 16R:

(225 x .60 x 2) + (16 x 25.4)= 676.4 mm.

you should always try to preserve your original tire diameter unless you really know what you're doing and you know how the car will react with the new specs.

just to answer your question, it seems like you should go for the 245/55 16.

quote:
Originally posted by as_soft:
Hi

I have a '93 LS 400 with 4 Goodyear 225/60 /16 that came on the car.
What tires should I replace them with
235/60, 235/55, 245/55 - / 16
I live in NJ therefore I need all weather tires

I'm wondering if anyone could give me the formula to calculate the diameter or/and the circumference of the tire

Thanking you in advance for your help

Ari


IP: Logged

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